<template>
  <view class="content">
    <!-- 1.自定义导航 -->
    <Navbar></Navbar>
    <!-- 
          scroll-y    允许垂直滑动
          @scrolltolower 滑动到底部触发的事件
          refresher-enabled 允许下拉刷新
          @refresherrefresh 下拉刷新事件
          refresher-triggered - true代表刷新中
       -->
    <scroll-view
      scroll-y
      class="main"
      @scrolltolower="scrolltolower"
      refresher-enabled
      @refresherrefresh="refresherrefresh"
      :refresher-triggered="refresherTriggered"
    >
      <!-- 轮播图 -->
      <Carousel :banners="banners" height="280rpx"></Carousel>
      <!-- 分类栏目 -->
      <CateScroll :categoryHeadMutli="categoryHeadMutli"></CateScroll>
      <!-- 人气推荐 -->
      <view class="panel recommend">
        <view class="item" v-for="item in hotMutli" :key="item.id">
          <view class="title">
            {{ item.title }}<text>{{ item.alt }}</text>
          </view>
          <navigator
            hover-class="none"
            :url="`/pages/recommend/index?type=${item.type}`"
            class="cards"
          >
            <image
              mode="aspectFit"
              v-for="img in item.pictures"
              :key="img"
              :src="img"
            ></image>
          </navigator>
        </view>
      </view>
      <!-- 新鲜好物 -->
      <view class="panel fresh">
        <view class="title">
          新鲜好物
          <navigator
            hover-class="none"
            class="more"
            url="/pages/recommend/index?type=5"
            >更多</navigator
          >
        </view>
        <view class="cards">
          <navigator
            hover-class="none"
            :url="`/pages/goods/index?id=${item.id}`"
            v-for="item in homeNew"
            :key="item.id"
          >
            <image mode="aspectFit" :src="item.picture"></image>
            <view class="name">{{ item.name }}</view>
            <view class="price">
              <text class="small">¥</text>{{ item.price }}
            </view>
          </navigator>
        </view>
      </view>
      <!-- 热门品牌 -->
      <view class="panel brands">
        <view class="title">
          热门品牌
          <navigator hover-class="none" class="more" url="/pages/list/index"
            >更多</navigator
          >
        </view>
        <view class="cards">
          <navigator hover-class="none" url="/pages/goods/index">
            <image
              mode="aspectFit"
              src="http://static.botue.com/erabbit/static/uploads/brand_logo_1.jpg"
            ></image>
            <view class="name">小米</view>
            <view class="price">99元起</view>
          </navigator>
          <navigator hover-class="none" url="/pages/goods/index">
            <image
              mode="aspectFit"
              src="http://static.botue.com/erabbit/static/uploads/brand_logo_2.jpg"
            ></image>
            <view class="name">TCL</view>
            <view class="price">199起</view>
          </navigator>
          <navigator hover-class="none" url="/pages/goods/index">
            <image
              mode="aspectFit"
              src="http://static.botue.com/erabbit/static/uploads/brand_logo_3.jpg"
            ></image>
            <view class="name">饭小宝</view>
            <view class="price">9.9起</view>
          </navigator>
          <navigator hover-class="none" url="/pages/goods/index">
            <image
              mode="aspectFit"
              src="http://static.botue.com/erabbit/static/uploads/brand_logo_4.jpg"
            ></image>
            <view class="name">鳄鱼</view>
            <view class="price">299起</view>
          </navigator>
        </view>
      </view>
      <!-- 猜你喜欢 -->
      <Guess :homeGoodsGuessLike="homeGoodsGuessLike"></Guess>
    </scroll-view>
  </view>
</template>

<script>
import Navbar from "./components/Navbar.vue";
import {
  getHomeBanner,
  getHomeCategoryMutli,
  getHomeHotMutli,
  getHomeNew,
  getHomeGoodsGuessLike,
} from "@/api/home";

export default {
  components: { Navbar },
  computed: {},
  methods: {},
  data() {
    return {
      // refresherTriggered当前下拉刷新的状态
      refresherTriggered: false,
      banners: [],
      categoryHeadMutli: [],
      //   人气推荐
      hotMutli: [],
      //   新鲜好物
      homeNew: [],
      //   猜你喜欢
      homeGoodsGuessLike: [],
      //   guessParams: { page: 1, pageSize: 10 },
      /*
          定义在data里面的数据，那么页面就会监听数据的变化，data的数据变化了，页面会响应式的更新
          如果我没有定义在data中，那么这个数据变化了，页面也不用更新，从而提升性能
        */
    };
  },
  async onLoad() {
    this.getHomeBanner();
    this.getHomeCategoryMutli();
    // 热门推荐
    this.getHomeHotMutli();
    // 新鲜好物
    this.getHomeNew();
    // 检测是否有请求发送中
    this.loading = false;
    // 猜你喜欢总页数，由后台小哥告诉我
    this.guessPages = 1;
    // 猜你喜欢的分页数据
    this.guessParams = { page: 1, pageSize: 10 };
    // 猜你喜欢
    this.getHomeGoodsGuessLike();
  },
  methods: {
    async getHomeBanner() {
      const res = await getHomeBanner();
      this.banners = res.result;
    },
    async getHomeCategoryMutli() {
      const res = await getHomeCategoryMutli();
      this.categoryHeadMutli = res.result;
    },
    async getHomeHotMutli() {
      const res = await getHomeHotMutli();
      this.hotMutli = res.result;
    },
    async getHomeNew() {
      const res = await getHomeNew();
      this.homeNew = res.result;
    },
    async getHomeGoodsGuessLike() {
      const res = await getHomeGoodsGuessLike(this.guessParams);
      //   这里要改一下，改成数据追加
      //   this.homeGoodsGuessLike = res.result.items;
      //   改成数据追加
      this.homeGoodsGuessLike = [
        ...this.homeGoodsGuessLike,
        ...res.result.items,
      ];
      this.guessPages = res.result.pages;
    },
    async scrolltolower(e) {
      /*
          优化- 添加节流
          1. 触底时，检测是否有请求在发送中 - 可以通过 loading 控制
          2. 有的话，就不要再发
          3. 没有的话，设置 loading 为true，发送请求，请求回来，设置为false
          */
      if (this.loading) {
        return;
      }

      //   console.log("我已经滚到底部了，不要再滚了 -----> ", e);
      //   是否还有下一页的数据，当前页数 < 后台告知的总页数
      if (this.guessParams.page < this.guessPages) {
        // 页码+1，发送请求，数据回来追加进去
        this.guessParams.page++;
        this.loading = true;
        await this.getHomeGoodsGuessLike();
        this.loading = false;
      }
    },
    async refresherrefresh(e) {
      /*
            下拉刷新
            1. 查阅api，开启允许下拉刷新refresher-enabled和绑定下拉刷新事件refresherrefresh
            2. 数据处理
                2.1 清空旧数据 - data中的数据，页码数据
                2.2 发送请求，拿回新数据
        */
      //   console.log("下拉刷新~", e);

      /* 
        一进入下拉刷新，就把状态设置为true，数据都回来了，就设置为false
      */
      this.refresherTriggered = true;

      this.banners = [];
      this.categoryHeadMutli = [];
      this.hotMutli = [];
      this.homeNew = [];
      this.homeGoodsGuessLike = [];

      this.loading = false;
      this.guessPages = 1;
      this.guessParams = { page: 1, pageSize: 10 };

      Promise.all([
        this.getHomeBanner(),
        this.getHomeCategoryMutli(),
        this.getHomeHotMutli(),
        this.getHomeNew(),
        this.getHomeGoodsGuessLike(),
      ]).then(() => {
        this.refresherTriggered = false;
      });
    },
  },
};
</script>

<style lang="scss" scoped>
.content {
  height: 100vh;
  display: flex;
  flex-direction: column;
}
.main {
  flex: 1;
  overflow: hidden;
  background-color: #f7f7f8;
}
/* 公共面板 */
.panel {
  margin: 20rpx 20rpx 0;
  border-radius: 10rpx;
  background-color: #fff;
  .title {
    display: flex;
    align-items: center;
    padding: 24rpx 24rpx 0;
    font-size: 32rpx;
    color: #262626;
    position: relative;
    text {
      font-size: 24rpx;
      color: #7f7f7f;
      margin-left: 18rpx;
    }
  }
  .more {
    position: absolute;
    right: 24rpx;
    font-size: 26rpx;
    color: #7f7f7f;
  }
  .cards {
    display: flex;
  }
  .name {
    overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap;
  }
}
/* 推荐专区 */
.recommend {
  display: flex;
  flex-wrap: wrap;
  .item {
    display: flex;
    flex-direction: column;
    width: 50%;
    height: 254rpx;
    border-right: 1rpx solid #eee;
    border-top: 1rpx solid #eee;
    &:nth-child(2n) {
      border-right: 0 none;
    }
    &:nth-child(-n + 2) {
      border-top: 0 none;
    }
  }
  .cards {
    flex: 1;
    padding: 15rpx 20rpx;
    justify-content: space-between;
    image {
      width: 48%;
    }
  }
}

/* 新鲜好物 */
.fresh {
  min-height: 320rpx;
  .price {
    line-height: 1;
    text-align: left;
    font-size: 26rpx;
    color: #cf4444;
  }
  .small {
    font-size: 80%;
  }
}
.fresh .cards navigator,
.brands .cards navigator {
  width: 25%;
  padding: 15rpx 20rpx 20rpx;
  line-height: 1;
  text-align: center;
}
.fresh image,
.brands image {
  width: 126rpx;
  height: 126rpx;
}
.fresh .name,
.brands .name {
  margin: 20rpx 0 16rpx;
  font-size: 24rpx;
  color: #262626;
}
.brands {
  .price {
    font-size: 24rpx;
    color: #999;
  }
}
</style>
